Datasheet THAT1512, THAT1510 Datasheet (THAT Corporation)

THAT Corporation

Low Noise, High Performance

Microphone Preamplifier IC

THAT 1510, 1512

FEATURES

Excellent noise performance

·

through the entire gain range

Exceptionally low THD+N over the

·

full audio bandwidth

Low power consumption: 7mA typ.

·

Wide bandwidth: 3MHz typ. @

·

G=1000 (THAT 1510)
High Slew Rate: 28 V/ms @ G=10

·

and C

Wide Output Swing: ±13V typ. on

·

=50pF (THAT 1510)

L

±15V supplies

Gain adjustable from 1 to >1000

·

with a single external resistor

Drop-in compatible with SSM-2017

·

(THAT 1510)

Description

The THAT 1510 and 1512 are high perfor­mance audio preamplifiers suitable for micro­phone preamp and bus summing applications.
The ICs are pin compatible with the Analog De­vices SSM2017 in both the 8-pin DIP and
16-pin SOIC packages.

The THAT1512 follows a different gain
equation than the 1510, but exhibits signifi­cantly lower noise at lower gain settings and is
recommended for new designs.

Designed from the ground up in THAT's
complementary bipolar, dielectric isolation

APPLICATIONS

Mixing Consoles

·

Public Address Systems

·

Analog and Digital Snakes

·

Breakout Boxes for

·

Digital Systems

Sonar

·

Paging and Intercom systems

·

Instrumentation

·

process, the THAT 1510 and 1512 improve on
existing integrated microphone preamps by of­fering lower noise at low gains, better distor­tion characteristics, lower power consumption,
higher slew rate and bandwidth, and increased
output voltage swing. The parts are fully pro­tected against ESD on all critical pins, and reli­ability is further enhanced by their reduced
power requirements.

In short, the THAT 1510 and 1512 provide
superior performance in a popular format at an
affordable price.

V+

-In

+In

RG1

RG2

V-

5k

5k

­+

Out

Ref

Table 1. 1510 / 1512 pin assignments

5k

(10k)

+1

+1

5k

(10k)

5k

5k

Figure 1. THAT 1510 / 1512 Equivalent Circuit Diagram

(THAT 1512 values shown in parentheses)

THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA

Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com

Pin Name DIP SO16

RG1 1 2

-In 2 4

+In 3 5

V- 4 7

Ref 5 10

Out 6 11

V+ 7 13

RG2 8 15

Gain Equation DIP-8 SO16

k

10 W

G

=+1

RG

G

=+055.

RG

Table 2. Ordering Information

k

W

1510P 1510S

1512P 1512S

Page 2 THAT 1510 / 1512 Microphone Preamplifier

Preliminary Information

SPECIFICATIONS

1

Absolute Maximum Ratings (TA= 25°C)

Positive Supply Voltage (VCC) +20 V Operating Temperature Range (TOP) -40 to +85°C

Negative Supply Voltage (V

Output Short-Circuit Duration (t

Lead Temp. (T

) (Soldering 10 sec) 260 °C

LEAD

) -20 V Storage Temperature Range (TST) -40 to +125°C

EE

) Continuous Junction Temperature (TJ) 150°C

SH

Recommended Operating Conditions

Parameter Symbol Conditions Min Typ Max Units

Positive Supply Voltage V

Negative Supply Voltage V

CC

EE

Electrical Characteristics

Parameter Symbol Conditions Min Typ Max Min Typ Max Units

+5 +20 V

-5 -20 V

2

1510 1512

Supply Current ICC,|IEE| No signal — 6.1 8.2 — 6.1 8.2 mA

V

=|VEE| = 20V — — 8.4 — — 8.4 mA

CC

Input Bias Current I

Input Offset Current I

B-OFF

Output Referred Offset Voltage Vos
Input Referred Offset Voltage Vos

No signal; Either input — 8.6 25 — 8.6 25 mA

B

connected to GND

No signal — — ±2.5 — — ±2.5 mA

OR

IR

No Signal, VCM=0 — — ± 50 — — ± 25 mV

60 dB gain — — ± 1.2 — — ± 1.2 mV

Input Voltage Range

Common Mode V

Normal Mode V

IN-UNBAL

Differential Gain G

Common mode, all gains — ± 13 — — ± 13 — V

IN-CM

Unbalanced — ± 13 — — ± 13 — V

One input to GND, 0dB gain

diff

0 — 70 0 — 60 dB

Ref Input Voltage Range — ± 8 — — ± 8 — V

Ref Input Impedance — 10 — — 15 — kW

Ref Input Gain to Output — 0 — — 0 — dB

Input Impedance Z

IN-DIFF

Differential

0dB gain — 32||1.9 — — 37||1.9 — MW||pF
20dB gain — 32||2.0 — — 37||2.0 — MW||pF
40dB gain — 32||2.5 — — 36||3.1 — MW||pF
60dB gain — 29||8.0 — — 31||13.9 — MW||pF

Z

IN-CM

Common mode

all gains — 8||7.7 — — 9||7.7 — MW||pF

1. All specifications are subject to change without notice.

2. Unless otherwise noted, V

= +15V, VEE= -15V, TA=25°C,

CC

THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA

Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com

600031 Rev. 7/23/02 Page 3
Preliminary Information

Electrical Characteristics (Cont’d)

Parameter Symbol Conditions Min Typ Max Min Typ Max Units

1510 1512

Common Mode Rejection CMR VCM=±10V;DCto60Hz

0 dB gain 20 55 — 20 55 — dB
20 dB gain 40 75 — 40 75 — dB
40 dB gain 60 95 — 60 95 — dB
60 dB gain 80 115 — 80 115 — dB

Power Supply Rejection PSR VCC=|VEE|; ±5V to ±20V; DC to 60 Hz

0 dB gain — 85 — — 85 — dB
20 dB gain — 105 — — 105 — dB
40 dB gain — 120 — — 120 — dB
60 dB gain — 124 — — 124 — dB

Total Harmonic Distortion THD+N V

= 7Vrms; RL=5kW

OUT

f = 1kHz; BW = 20 kHz

0 dB gain — 0.0005 — — 0.0005 — %
20 dB gain — 0.0005 — — 0.0005 — %
40 dB gain — 0.0005 — — 0.0005 — %
60 dB gain — 0.005 — — 0.005 — %

f = 20kHz; BW = 80 kHz

0 dB gain — 0.002 — — 0.002 — %
60 dB gain — 0.005 — — 0.005 — %

Equivalent Input Noise e

n(OUT)

f = 1kHz,

0dB gain — 57 — — 34 — nV/ÖHz
20dB gain — 7 — — 4.6 — nV/ÖHz
40dB gain — 1.7 — — 1.4 — nV/ÖHz
60dB gain — 1 — — 1 nV/ÖHz

Input Current Noise i

n

60dB gain — 2.3 — — 2.3 — pA/ÖHz

Noise Figure NF 60dB gain

R

= 150 W — 1.6 — — 1.6 — dB

S

R

= 200 W — 1.3 — — 1.3 — dB

S

Slew Rate SR RL=2kW

C

=50pF 16 28 — 16 24 — V/ms

L

Bandwidth -3dB BW

RL=2kW; CL=10pF

-3dB

0dB gain — 15 — — 11 — MHz
20dB gain — 8 — — 9 — MHz
40dB gain — 7 — — 7 — MHz
60dB gain — 3 — — 1.6 MHz

Output Gain Error G

ER (OUT)

f = 1kHz; RL=2kW

0dB gain — ± 0.25 ± 1 — ± 0.25 ± 1 dB
20dB gain — ± 0.20 ± 1 — ± 0.20 ± 1 dB
40dB gain — ± 0.20 ± 1 — ± 0.20 ± 1 dB
60dB gain — ± 0.05 ± 0.5 — ± 0.05 ± 0.5 dB

Output Voltage Swing V

Output Short Circuit Current I

Minimum Resistive Load R

Maximum Capacitive Load C

Gain Equation

O

SC

Lmin

Lmax

RL=2kW

all gains ±13 ±13.3 — ±13 ±13.3 — V

RL=0W — ±17 — — ± 17 — mA

—2— —2— kW

— — 200 — — 200 pF

k

10 W

G

=+1

RG

G.

=+05

k

5 W

RG

Gain Resistor (ideal values) RG 0dB gain ¥ 10k W

20dB gain 1,100 526.3 W
40dB gain 101 50.3 W
60dB gain 10 5 W

THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA

Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com

Page 4 THAT 1510 / 1512 Microphone Preamplifier

Preliminary Information

+15

C6

-In

C1
470p

R1

1k

C2

+In

470p

C3

47p

R2
1k

Figure 2. Basic 1510 / 1512 Circuit

Applications

Gain Setting

A single external resistor between the RG1 and
RG2 pins is all that is needed to set the gain of the
THAT 1510 / 1512, according to the formulae

k

for the 1510:

for the 1512:

k

10 W

G

=+1

G

=+055.

RG

RG

or

RG

k

W

or

RG

W

=

G

-101

k

=

G

-505W.

7

V+

100n

Out

Out

6

RG

2

-In

8

RG2

Ref

1
3

RG1

+In

V-

4

5

U1
THAT
1510/1512

C9

100n

-15

For unity gain operation on the 1510, RG1 and

RG2 may be left open. RG should be set to 10kW in
the 1512. To avoid excess noise and ensure tempera­ture stability, non-inductive wirewound or metal-film
resistors are recommended for RG.

Total gain accuracy will depend on both the toler­ance on RG, and on the gain equation accuracy of the
THAT 1510/1512. Total gain drift will result from
the mismatch between the tempco of RG and the

-In

+In

+15

C6

C1
470p

C2
470p

C3

47p

R1
1k

R2
1k

RG

2
8

1
3

-In
RG2

RG1

+In

C9

100n

V+

V-

-15

100n

7

Ref

4

U1

THAT 1510/1512

Out

6

5

U2
6

C8

100n

510k

2
3

353

Figure 3. 1510 / 1512 Circuit with Output Offset Correction

THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA

Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com

Out

R3

600031 Rev. 7/23/02 Page 5
Preliminary Information

+48V

+15

In-

In+

R6

6k8

C1
470p

C2
470p

C3

47p

R5

6k8

C4

47u

C5

47u

R3

51R

R4

51R

R1
1k

R2

1k

1N5818

D4

1N5818

D1

1N757

D3

D5
1N5818

D6
1N5818

D2

1N757

RG

2

-In

8

RG2

1

RG1

3

+In

-15

V-

V+

4

100n

C6

100n

7

Ref

C9

Out

U1

5

THAT 1510

Out

6

Figure 4. Typical 1510 / 1512 Circuit with Phantom Power

tempco of the internal resistors (±20 ppm/°C typi­cal).

Noise Performance

Thoughtful design results in these devices having
significantly lower noise at low gains than similar IC
microphone preamps. At zero dB gain, equivalent in
put noise of the THAT 1510 is 55 nV/ÖHz, nearly
6 dB better than competitive IC designs. The un
usual topology of the THAT 1512 results in an equiv
alent input noise of 34 nV/ÖHz at zero dB gain, which
makes it comparable to some of the better discrete
designs currently available. At 1 kHz, the equivalent
input noise for both devices is 1 nV/ÖHz at 60 dB
gain.

Inputs

Protection diodes are employed at all pins except
V+ and V- of the THAT 1510/1512. These diodes re
duce the likelihood of accidental ESD/EOS damage to
the IC. Other diodes across the base-emitter junc
tions of the input transistors prevent reverse bias of
these junctions and consequent degradation of their
noise performance.

The inputs of the THAT 1510 and1512's are float
ing, so a dc bias connection is required to maintain
the inputs within the IC's input common-mode range.

Four different schemes are shown in Figures 2, 3, 4,
and 5. Note that the values of R1 and R2 in these fig­ures should be kept small to minimize pickup of un­wanted noise and interference. A value of 1 kW is
often used, since some microphones require a differ­ential input impedance of this magnitude. Unfortu

-

nately, one would usually desire a significantly higher

-

common mode input impedance to minimize the

-

-

common mode degradation caused by unbalanced
source impedances. Figure 5 shows a technique
which allows higher common mode input impedance
while maintaining a lower differential source imped

-

ance.

Reference Terminal

The "Ref" pin provides the reference for the out
put signal, and is normally connected to analog
ground. If necessary, the "Ref" pin can be used for

-

-

offset correction or DC level shifting. A non-zero ref
erence source resistance will reduce the IC's com
mon-mode rejection (CMR) by the ratio of
10 kW/R

REF

.

-

-

-

Phantom Power

Phantom power is required for condensor micro

-

phones. A phantom power circuit is shown in Fig
ure 4. Diodes D1 through D6 are necessary to
protect the THAT 1510/1512 from transient voltages

-

-

THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA

Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com

Page 6 THAT 1510 / 1512 Microphone Preamplifier

+48V

R6

-In

+In

6k8

C1
470p

C2

470p

C3

47p

R9

2k7

C4

R3

4R7

47u

R5

6k8

C5

R4

4R7

47u

Figure 5. Preferred 1510 / 1512 Circuit with Multiple Phantom Power

D3

SB160

D4

SB160

+15

D1
SB160

D2
SB160

R1

10k

R2

10k

-15

RG

2

-In

8

RG2

1

RG1

3

+In

Preliminary Information

+15

C6

100n

7

V+

Ref

V-

4

C9

100n

-15

Out

U1

5

THAT
1510/1512

6

Out

that may occur when microphones are connected or
disconnected.

While figure 4 shows a protection scheme that re­flects the current industry practice, a better solution
is shown in figure 5. Like figure 4, this circuit uses a
diode bridge (composed of very fast 1N5818s), but in
this case, the diodes are connected directly to the

Package Information

The THAT 1510 and 1512 are available in 8-pin
DIP and 16-pin SOIC packages. The package dimen-

power supply rails. While this arrangement doesn't
keep the inputs inside the common mode range, it
has the advantage of working even when the power is
off. For further insights in to this subject, see The 48
Volt Phantom Menace, by Gary K. Hebert and Frank
W. Thomas, presented at the 110th AES Convention.

sions are shown in Figures 6 and 7 while pinouts are
given in Table 1.

Figure 6. -P (8-pin DIP) version package outline Figure 7. -S16 (16-pin SO) version package outline

THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA

Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com